Grayed out appended Hemi lamps from older blender with odd behavior
Those two hemi's appear to be disabled in viewport. This is different to hidden in viewport, which is the eye button. disabled in viewport is the computer screen, as you can see in the first image.

If you click the Filter button next to the search (image below), you can then select what options appear next to the name of the object. Also, you can see that the cube here is disabled in the viewport, and is grayed out because of that.



You want to open it, and in particular, turn on the 'show in viewport'.



Here I have enabled show in viewport, and the cube is now visible for me in viewport.



I hope this helps, and if it's not this issue, then I guess it's something to do with 2.79 hemis in 2.8.